Focusing x-rays
wirelesswarrior at Safe-mail.net
wirelesswarrior at Safe-mail.net
Tue Sep 22 18:56:54 PDT 2015
-------- Original Message --------
From: jim bell <jdb10987 at yahoo.com>
Apparently from: cypherpunks-bounces at cpunks.org
To: Juan <juan.g71 at gmail.com>, "cypherpunks at cpunks.org" <cypherpunks at cpunks.org>
Subject: Re: How much/what hardware does the rowhammer DRAM bug affects?
Date: Fri, 18 Sep 2015 21:30:32 +0000 (UTC)
> >Within the last couple of months, I think somebody was arrested for planning some sort of "X-ray death ray". http://nypost.com/2015/08/18/kkk-member-built-death-ray-machine-to-kill-muslims-and-obama-prosecutors-say/ But only a dweeb doesn't know that X-rays cannot be focussed. (With one very obscure exception not applicable here. Find it and get an "attaboy!". )
>
> Its called Grazing Incidence
>
> https://en.wikipedia.org/wiki/X-ray_optics
>
>
> >Microwaves, OTOH, can be focussed rather easily. The frequency is 2.45 Ghz, at about 1 Kilowatt. (wavelength about 12 centimeters.) I'd have to consult a Radio Amateur's handbook, but a modern dish (intended or Directv or Dish network) could probably get 15-20 db of gain, compared with isotropic. An old-style 8-foot dish probably would do 30 db gain. That would be 100 kilowatts ERP.
>
> >Such an unshielded (open) device would probably impair WiFi at 2.5 Ghz severely, if you're close to it, say a few hundred feet away. Fortunately, I think microwave ovens have better than 60 db of shielding. A few 10s of feet, away, hardware damage might occur if that full 1 kw were allowed to leak out.
> Jim Bell
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